Metadata storage system and management method for cluster file system

摘要

The present invention provides a metadata storage system and a management method for a cluster file system. The metadata of the cluster file system is stored by using a DRAM+SSD+HDD three-tier architecture, and the metadata is written sequentially into a metadata buffer in the DRAM based on write-in time. When a metadata buffer fully written, it is written back into the SSD sequentially to form a new metadata storage unit, and corresponding metadata index information in a header structure thereof is stored into the DRAM in a form of a metadata index unit.

主权项

1. A metadata storage system in a cluster file system, comprising:
a Dynamic Random Access Memory (DRAM); a Solid-state Drive (SDD); wherein the DRAM comprises multiple metadata buffers; metadata in each metadata buffer is written sequentially based on write-in time, each metadata buffer corresponds to a header structure for storing metadata index information of the buffer; a new first metadata index unit is formed in the DRAM each time data in a first metadata buffer is written back into the SSD, to store a metadata index information comprised in a header structure of the first metadata buffer; and wherein the SSD comprises a metadata file, and the metadata file comprises multiple metadata storage units organized in a sequence of write-back time; a new first metadata storage unit is formed in the SSD each time the data in the first metadata buffer is written back into the SSD, to store the metadata written into the SSD from the first metadata buffer; and the first metadata storage unit corresponds to the first metadata index unit in the DRAM, wherein the first metadata buffer is anyone of the multiple metadata buffers in the DRAM.